There are several different types of seizures, and they can happen for many different reasons. Seizures that are not due to epilepsy are sometimes called 'non-epileptic seizures'. They can have a physical cause such as low blood sugar (hypoglycaemia) or something related to the way the heart is working. Or non-epileptic seizures may have a psychological cause.
Cerakote in AR Barrel. Okay, so I built an AR using a BCM 18 stainless barrel. I thought I'd be smart and had the barrel professionally cerakoted by a local place that does work for Sig. Well, it looks like they may have used a pipe cleaner to block the gas port (total guess on my part), but it looks like there's some cured cerakote inside the barrel around the gas port. From what I can see, it looks like a small splotch. If I didn't know better, I'd think the gas port hole was over sized by the look of the cerakote. I can easily get a bore brush down the barrel so it doesn't seem to be obstructive.
To have someone over the barrel means to have someone totally at your mercy. It is a nautical term, which derives from the practice of hanging a drowned, usually unconscious person over a barrel to clear their lungs of water. The fate of the patient was determined solely by the actions of those administering the treatment. In other words, he was at their mercy.